- product_vertex = Vertex.new
- product_vertex.left_node = v1
- product_vertex.right_node = v2
- product_graph << product_vertex
+ product_graph << Vertex.new({:g1_vertex => v1, :g2_vertex => v2})
+ end
+ end
+ self.edges.each do |e1|
+ e1_vertices = e1.vertices
+ other.edges.each do |e2|
+ e2_vertices = e2.vertices
+ source = product_graph.vertices.find {|v| v.g1_vertex == e1_vertices[0] and v.g2_vertex == e2_vertices[0]}
+ destination = product_graph.vertices.find {|v| v.g1_vertex == e1_vertices[1] and v.g2_vertex == e2_vertices[1]}
+ product_graph.connect source, destination
+ source = product_graph.vertices.find {|v| v.g1_vertex == e1_vertices[0] and v.g2_vertex == e2_vertices[1]}
+ destination = product_graph.vertices.find {|v| v.g1_vertex == e1_vertices[1] and v.g2_vertex == e2_vertices[0]}
+ product_graph.connect source, destination